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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc5d075887ed5a5450dda57299d98aedaf0e2f1bf2631712976b9c7b6ca4141' 
  AND token = '5bJD2MP1E6DD158SWp6lNlOHq9aj4pYF7heOJJA7G0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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