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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c48962e5bf529e9f8b78afed5327e912ed7c791324433261d1d77aa1784a6ff' 
  AND token = 'SxyLcHzrY5MuB+nUotm0j8pL8UuNf0dDfBt+KBTgOrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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