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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e2a27600ff488a0736c34cc57d6421d88cde1b2d0fd7563c205c5cba8f45bb' 
  AND token = '053yvsUAwukIrsfKoQxNnJDXEH1QbiL5SIbl6QgDOXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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