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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b39d70e50091ae070373fb071715a85d0cf74c65a825763bd4aa0d1c0d50d14' 
  AND token = 'czx9sFfzhC7FrSF5pJuPHyGjONIw50ly0qlrZkbLXEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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