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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae266cfed82ded072c1c397c0bbd465b2e687ddb434724e535a73c253977bc3' 
  AND token = '2rcLKxuqDRbDU5YM+fLlLx/8reSl8pa478TZG/0Oxlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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