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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6646d63557e3a74f5548f90c50a1b0116c9e6b8932dd8ecfa65a5ec49cd7a5e' 
  AND token = 'QsfpQc/yoIR5jC+b9vl8vtA60G59j+9AHdpxMlEfCqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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