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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ea5b9d32138d5a33ea9a2e2d9c04785a3f5545469a028aaeceb970a3a2db6c' 
  AND token = '0Nnl6b9+bsu8gspU0Ck7NLlobZZugAxxBA0wewf+gAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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