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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3d029b59a36ae2ae55135a24e095881693e9dd35c39917863f7deb0e22ebca2' 
  AND token = 'H+RpFddDa4QFEtCZ8PJevlvq8fZRODZvGd12VBDUXR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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