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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc90f3dad4f9f5fa7e9ba4a64ac3eff8a2be1a332910c84a0f60566292cee8ed' 
  AND token = 'KWM6IPYDiekLKYPYlEU7b6DTYYyR1RjwgilJtnBvRrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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