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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06c5b1217dc3921bdb9b40d95168c0fa738c270dd5d218b5187a5e63fccb4ea' 
  AND token = 'cesc6VzhFZDNfyeRvqAk9+8qbwlQ6xia3I5enjd+v7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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