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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394504f5801cd9eed0abda0c8c22481bc1290efde750fcd3fcf5960667a9d030' 
  AND token = 'qwyIfiMAnZ7f2b8gDf0putbnsA7lcw4zfEkBUTeKnzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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