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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89360be1cb2fc462a1bde1a9ca5489210243f06867294e1ff2fb2afcd0921b56' 
  AND token = 'ZSTt5MzCXxEtnILJEOP90cmhyFQD7SwN+xgma1fDfsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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