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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f8ce149ed342e71ce33de25dfc6c4da145b0c01558b96bb6616af41fddb481' 
  AND token = 'rBnrTeDbKHfTGDxbxqDBKfSe+36La9LWofmv+bt4fak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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