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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0208e8b49b0e3c8aa3a59e95439516105bb679f0ee0fbad50ebd2d6bbb340880' 
  AND token = 'xeD2CZDQTvIrbjsLDgZX2FmqRLrl8fLAnrEVnSniZEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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