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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2947645a000a711b9cc833e76e689f3a946d1bd024351533e0103bbdc7a00d52' 
  AND token = 'K86K/jiARi44eY+SgsQNBeSiSuxZ1uy8Ib25ZRIgxE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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