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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b7c4ef488ba925add599d386d16e87ede7da99e4c6ed672842fcaf63ef570c' 
  AND token = '/03MifDP7KnQAKphNteET92a0x/IRfZNmmYDBGZ+jJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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