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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab15076f167bcd086a108cef905e36d2729f69c34a1122e6722ea69464bf7b3' 
  AND token = 'IRojcDeIpy9W1hLtzqr4+7ftASR8n/yjE8dyeUrMbkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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