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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcff0d7bf2d21d7aef1b9d6d1811a9d48609ea4ff4483d7b4bb632359f97e1d3' 
  AND token = 'Yj4LOTgKnqlIsP/3B6Z/LBezqrnXmS/9WO7kTxTXeg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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