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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be24dd588073be2130c3b129c604cd833b8dd261aa741ffb6ab2c450fd8dec62' 
  AND token = 'MLEDMq/2LQK7OB5Vtv0VooCK52mk37AM+8StZxW3g9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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