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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f9b08556d5824409d9fdbc62ba6f54d38f8786d1c77fc18ac68feaeac23734b' 
  AND token = 'DL6iQik0kQUArHZar61HSX5k/kLl3CKnHIqN+GXoKac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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