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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a6d9aac6cc4be79873b6c2ec54a16b3b863979bcba133980441d0376c3b84b' 
  AND token = '7eBDiO/oBFk8N7mBcWQK2WjggQs1SPdDrxY1qRY1w3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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