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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2538052f885b31b94aa9dec05473b2198d28dbcb647f8476f63bcc3a1a5a746' 
  AND token = 'T+Wo8ribbW36yhWiwgbuWY1yxPy3YKzw48fLALuc8kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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