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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe8f9a79320393e1b929f1f5bd041d8bf417543e5c5897dfde083414c770bb7' 
  AND token = 'j7nhyaFFLwz9kt0EyRXQuVBd6jAVIr4ImVp4Vywe3uQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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