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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718327ca5927e5ef278cc4366c063bf6bc555497db7ae5f52556a0694d9b66be' 
  AND token = 'k6sKsDm88tOmADYBmH08oeUkBGZyQ3JbXkMSgLnOMnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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