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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bc8c53494a92b55902a87dd33b7cde0cf8774be0e5a30b07f90c1fe37aa96c' 
  AND token = '2ifCJkDCBgw5GmCLukfiGTQkRuMklpX0OsgoHEzb4n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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