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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec69aed7aef668b8a425c5b0bd1ca89f30f2db730ee71e29f9f9e6fc1e383a52' 
  AND token = 'iadeO8HMXGzAEbsE3QEeKWhKNbWeo8sYKipmjjlAtyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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