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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0f5f490f7e4bd1a8ab693290c0bc3e1d8e0c6b6946ff30e86b3e9751a5234f' 
  AND token = 'zOogoaE07JLJ49GJgqV8dvbL7IRbR7gjxaSKC6o++QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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