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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad931583d61edcd3b7057435089b154cf4ce3511b61ecff034a6b5f196b48b45' 
  AND token = 'F/8MuSO3TBlrgYxcIpuHZF4VdYyHAhuQ+PitTw53Mvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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