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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bdc0babb45e1dfe7cb0a3a804310194625fc4f15d03d6dc4255062ca344f0bb' 
  AND token = 'IeDz6R+lnUPm6XjE8r25HeTSaSQyAzbMUSLMwsXho0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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