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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1372456474efff6f801c87c04ac4e2b78ccf596eed6ae9c61a3b5b25dfa6c4ba' 
  AND token = 'q6NYo9+dGwQkM1vN988tLTB2tf8J7AYGX323Ny+eQlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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