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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb71aadd9d4571efc25d922cb6ff16ea722e18789e68aa74ded7283c98cd93a' 
  AND token = 'VquQGyJ/AwJc5xdSl0WlLsg8fcNDKlrmxKaGqW0EcpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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