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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb741a30bb556637d645b25237e2ad9efce167c956c99fdf8d7e4237cc34c73' 
  AND token = '+AI+w6PvqdDNJQatJrwE5PxASe3VFWTUfz0ZA+gLzu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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