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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '521c6b6d635fa62567680e1f2a539ed110a641e9124f9ecdb5567b7c3d9d90c8' 
  AND token = '2i10aRt5JwjitGZC93/+HEoi0KH6Bq3qt019JNtYCOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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