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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b37034080febe0a813d53f90bddbea6fe9bac2b4c6344e998fdfbd05d1e9e000' 
  AND token = 'E7P54Kuu8g3+Eq+JiZFKN+Knie53JoMieVGiEsdp7cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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