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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f6ffcbd0301f09743a2d57bcdc348d3584be30b6779c4d3ea86c5ebf769070' 
  AND token = '19p99Nx1o3+p3Ww1w73y3NzclbZSYtFqz+pT/BYlY9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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