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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e575fd7d4ce986492e8e64fa9ec8e4760ccea9e1045621f65db09b77cb51df' 
  AND token = '6gJwt5V6CWzUHVpjHlxf3NqQ1Y4Y0wFdX602WICTNpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}