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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5feb6a6fe865eed80bd63e6d4ad5072438d9eff8463b5c44b68cc02f5df9164' 
  AND token = 'Z3Gq1nDmwarEgPe4aQIcpQ4y14AQe5l8V3iEmg6M7+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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