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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e0cc5b1b90ff60bad74f559991fe82e9d984e80654f38a4321e0ca0ea66b1f' 
  AND token = 'cAxaKyKPEn8gCRc3xeEUHH/H4AffHag13R7qVgnFVWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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