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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd475f286b97ee3c1a768f2f0e0bf817cb9c207b28d365279203b7fd0e829e262' 
  AND token = 'BY9jExPnD7xg8KIw7PtyKrbM23KmAKx6tIVzc/LgkUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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