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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb895ddce77c586c020e9d6aabbfea1d4703a65cbac82645512ff5fb0ec9454e' 
  AND token = 'lq7qTCylkjDmjv9BvLUpf2JPceiO9c6DpNn50ndHc6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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