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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0581535effdbdb3767589208cf00f4e95982d7b3e8fd40fe12a581b07487d0' 
  AND token = 'xQCDLeR+H3GzOjr4+kXcupN0N+W9ZOE7fM8MbM4UJ74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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