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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9a4d7d6389db86f494a19c70e576c7bb5ffb9a1ab3da4a672b195b58b13484' 
  AND token = 'OZMyr8VGivVAO7Kz5trFHVnahP1NXUoB6RGr11TN1nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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