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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdac63c4ffe94081b91532b0c902c26a13e7d3b6e765839d8b5d7538e6245a5b' 
  AND token = '6E0ek4vE7e831I69iFx3cQ1XSbcEhPVmaO4nFx5up9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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