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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76093e1d707dc96e00407c790d741af84f620c081c1f5e3557575a58eb307faa' 
  AND token = 'DiT52EQRkzhuS5U+UV59vB6oV8ZXLF3uZzEVa22yYmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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