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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d7582625a3e0ac0934764bee724024e954717cdb9905067caef47cb4e0b5b6' 
  AND token = 'RaOWknrfy/2fVgB2k42PVdA2IWq1rS71kMRnA/zRc/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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