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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079f8d87edddfc80a15e1b67336fc6c71d74e3907b1fa1c4fd20ec0aafd023ed' 
  AND token = 'AcxDDHHX7yows3B7cLkv4A1caMsuh+37hMXq3PwUOqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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