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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3c26528bd55aa0eed6ce48518130a0be10aa6b7defe55c3b1077b3d275c7e2' 
  AND token = '3uZcHrrlSEHJ9gMnUKSaM/GNIwJZuk53D8QHjNCKHjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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