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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b59fc08468cc3d8a366227316394bcd22058d52e574b78a4ec52101b26b57e' 
  AND token = 'k4L7+SbssSOy3J+TVig5EjE2cd66jgNhcbSAut1PBrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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