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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a9e6dc8e17fff83dd8ca214e5e253ec3d4b1cfabb88248312e711b3c006d410' 
  AND token = 'ZIjLMLqTRTLRSLy8AJ9b6QIvdkto1r/utJBm8afD2JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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