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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b254e7c773774679ffc9480b108e3f80fa6eeb0dc937d20f42ed9c37ba19de' 
  AND token = 'NZcrLu0wn1V1Qt6lZ5fT9APlUFG56Sr+iyqVls7pwU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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