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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '299fa4f292b73ffc9ca3ce8b37bc24850df8ffe21ccc7000c759124b5ce960cb' 
  AND token = 'TL5WSg32f8+JRIAMOJRnZEtAZ30veDHwiXIO1m1FENE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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