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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de769c9653d04b75cc9f8a5a37d061d1cff8a89cd3f30b9a036f88481b105022' 
  AND token = 'Dz9a7gfSlUXJW4FO7Vuf2x/RtaJmxRlMJ383YHhoLvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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