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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20aa54c12b3f58b2a85e21e3a10d42c9554ef75dea69ee12f0f70bb2c417a2a0' 
  AND token = 'CeeNXn2oj7c8RPMp1O69LMPOC+wgmGKz34WELoioc+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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