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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ff637a623a08fcce926b7a13b973751ac45ff2108efd3f0c01f71c142bc290' 
  AND token = 'VP9LtB6MHlxrD1JbrlylIPfllcxhRgpRq4AxcnW+H0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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