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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b998749ad2a729c7902e927a170f0be1a1cd2c8d8b7f161f0f7f3f5776ae3279' 
  AND token = 'znqwHhRSAhTo0tQAivShfiAUZmMQ45yqXrewVEJNXc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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