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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e92f8948df789a4140bdb1f5ccaa6d190bd59b4a72b1dbdff73e8a6d03299a' 
  AND token = 'Y5pZOg9+0+cRwmGnkygOJHeoJOy0Yj8RU+F2ZPihpFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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