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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34b596b085a39e4b714249abf44008e71a3c9096287ac2397829fe37146dc89' 
  AND token = '5iAUKteIBV0+nmkrgM038KynDuqnUq6vllcB1qsEPj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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